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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceb84c1a792d92c37b06d081065053cb7409c8c6d337332c9f6ecaf1f086af83' 
  AND token = 'VfxcXiINPOt8fbeA0k2I8kWLiftG9EeW/n4i4VzmnT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}